Obama: Michelle was teasing Leno, not Gabby

8/15/12 8:03 AM EDT

President Barack Obama, in an Iowa radio interview broadcast Wednesday, tried to set the record straight on his wife's ribbing of Gabby Douglas for eating McDonalds after her gold medal win.

First lady Michelle Obama teased the Olympian during an appearance on Jay Leno on Monday, but the president said Douglas was not her target.

"You know, the truth is the first lady was teasing Jay Leno, not Gabby, because Gabby can afford anything because she’s so fit," Obama said in an interview broadcast Wednesday on Star 102.5 KSTZ-FM in Des Moines. "But the first lady’s been getting on Jay Leno a little bit about getting some exercise."

The president, speaking to the hosts of "Big Ken and Colleen in the Morning," also gave a rare glimpse into the first family's private life, talking about daughters Malia and Sasha spending the summer at sleep-away camp and just who's in charge of back-to-school shopping.

"I've got to admit, Michelle doesn’t trust me with all that stuff. She's just better organized than I am," Obama said. "My general theory is, you know, they look fine. You know, why do they need new stuff?"

He said when he was young, becoming president of the United States wasn't something he envisioned.

"I really liked basketball so I was thinking maybe I’ll grow to be 6’5” and I’ll be able to play in the NBA. I thought about being an architect, because I liked the idea of building buildings, and designing buildings. So it wasn’t really on my radar screen to be president," Obama said. "It wasn’t until I got older that I thought about maybe there might be some ways that I could help people by going into public service and going into government. And even then I wasn’t imagining myself necessarily being president, but just thinking about ways that I could help people out who hadn’t had as much opportunity as I did. And over time, it just evolved."